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Illinois Department of Transportation (IDOT) follow Illinois modified AASHTO T23 test method for making and curing concrete test specimens in the field. This provides the information when to remove form/falsework and open pavement to traffic. However, there is a lack of comparison of field-cured specimen strength with the strength of the actual in-place concrete item. The objective of this research is to build up the understanding of the current state of practice for field-curing methods. To achieve this objective, a comprehensive literature review was conducted to identify the field-curing methods used by various highway agencies. A total of 36 highway agencies (34 US highway agencies and 2 Canadian provinces) were reviewed using literature collected from the Transportation Research Information Service (TRIS) and standard specifications from DOTs’ webpages. It was found that majority of the transportation agencies use the field-curing cylinders (28 out of 36, 78%) followed by the maturity method (16 out of 36, 44%) to decide when to open pavement to traffic or removal of form/falsework. Only 12 out of 36 (33%) of transportation agencies use beams for determining field-strength. Further, 45% of the DOTs’ use field-curing cylinders more than beams for opening pavement to traffic. Both 100 mm x 200 mm (4 inch x 8 inch) and 150 mm x 300 mm (6 inch x 12 inch) were the commonly used sizes for cylinders. For beams, DOTs’ commonly use 150 mm x 150 mm x 500 mm (6 inch x 6 inch x 20 inch) specimen size. The commonly used field-curing methods for cylinders were casted in the same manner as concrete, field-cured in an insulated box such as cooler or under burlap/insulation near the concrete item. Whereas beams were commonly field cured in a damped sandpit or under burlap/ insulation near the concrete item.
Katangur, Tejaswi Reddy; Awaitey, John; and Patil, Juhi, "Influence Of Field-Curing Conditions On Strength Of Concrete Test Specimens" (2021). Technology. 7.